APA

World Health Organization, Akerele O., Heywood V. H., Synge H., World Conservation Union & World Wide Fund for Nature. (1991). The Conservation of medicinal plants : proceedings of an International Consultation, 21-27 March 1988 held at Chiang Mai, Thailand. Cambridge: Cambridge University Press.

Chicago

World Health Organization, Akerele Olayiwola, Heywood Vernon H, Synge Hugh, World Conservation Union and World Wide Fund for Nature. 1991. The Conservation of medicinal plants : proceedings of an International Consultation, 21-27 March 1988 held at Chiang Mai, Thailand. Cambridge: Cambridge University Press.

Harvard

World Health Organization, Akerele O., Heywood V. H., Synge H., World Conservation Union and World Wide Fund for Nature. (1991). The Conservation of medicinal plants : proceedings of an International Consultation, 21-27 March 1988 held at Chiang Mai, Thailand. Cambridge: Cambridge University Press.

MLA

World Health Organization, Akerele Olayiwola, Heywood Vernon H, Synge Hugh, World Conservation Union and World Wide Fund for Nature. The Conservation of medicinal plants : proceedings of an International Consultation, 21-27 March 1988 held at Chiang Mai, Thailand. Cambridge: Cambridge University Press. 1991.